EnumAllergies.swift

enum Allergies:UInt {
    
    static func hasAllergy(value:UInt, testAgainst: Allergies) -> Bool {
        return value & testAgainst.rawValue  > 0
    }
    case None = 0
    case eggs = 1
    case peanuts = 2
    case shellfish = 4
    case strawberries = 8
    case tomatoes = 16
    case chocolate = 32
    case pollen = 64
    case cats = 128
  
}



import XCTest

// Apple Swift version 2.0

class AllergiesTest: XCTestCase {
    
    func testBob() {
        
        XCTAssertTrue(Allergies.hasAllergy(34,testAgainst: Allergies.peanuts), "Bob is allergic to peanuts")
        XCTAssertTrue(Allergies.hasAllergy(34, testAgainst: Allergies.chocolate), "Bob is allergic to chocolate")
        XCTAssertFalse(Allergies.hasAllergy(34,testAgainst: Allergies.cats),  "Bob is not allergic to cats")
    }
    
    func testEggsNcats() {


        XCTAssertTrue(Allergies.hasAllergy(129, testAgainst: Allergies.eggs))
        XCTAssertTrue(Allergies.hasAllergy(129, testAgainst: Allergies.cats))
        XCTAssertFalse(Allergies.hasAllergy(129, testAgainst: Allergies.chocolate))
    }


    func testNone() {
        
        XCTAssertFalse(Allergies.hasAllergy(0,testAgainst: Allergies.pollen))
    }
    
    func testAll() {
        
        let allInt =  UInt(Array(0...7).reduce(0){ return ($0 | (1 << $1)) })
        
        XCTAssertTrue(Allergies.hasAllergy(allInt,testAgainst:Allergies.eggs))
        XCTAssertTrue(Allergies.hasAllergy(allInt,testAgainst:Allergies.peanuts))
        XCTAssertTrue(Allergies.hasAllergy(allInt,testAgainst:Allergies.shellfish))
        XCTAssertTrue(Allergies.hasAllergy(allInt,testAgainst:Allergies.strawberries))
        XCTAssertTrue(Allergies.hasAllergy(allInt,testAgainst:Allergies.tomatoes))
        XCTAssertTrue(Allergies.hasAllergy(allInt,testAgainst:Allergies.chocolate))
        XCTAssertTrue(Allergies.hasAllergy(allInt,testAgainst:Allergies.pollen))
        XCTAssertTrue(Allergies.hasAllergy(allInt,testAgainst:Allergies.cats))
        
    }
}